ONGUARDBulldog LS Bike / Cycle D U Keyed Lock 115mm x 292mm Black/Yellow

The weight of the box when this lock arrives gives confidence without even seeing the product. It's clearly made of solid material. You get five keys so can loose 4 before you have a problem.The double-lock mechanism should prevent the prying technique often used on single mechanisms. The bar and shackle are thick enough to ensure a substantial amount of effort would be required to grind through or warp the item out of shape. In fact, I think the size of the thing would put any opportunist off without a go.The downside is the size. That's partly my fault for not fully comprehending the measurements but I've got no-idea how anyone has managed to use the supplied frame mount. I can't find anywhere to position it on my bike, it's too big.This means it goes in my rucksack and weighs down my bag.If you have a regular spot to park you bike I feel you could confidently leave the lock there for when you arrive with your bike. Otherwise, the lock isn't designed for easy transport - check it will fit your bike before you buy.

I have had this lock for a short time only and it is good for the price paid. The lock is very heavy and sturdy. Unfortunately for me, it is too large for my bike (my fault, not the product) so I cannot comment on the lock holder as I cannot use it on my bike frame. The lock size in combination with its weight makes cycling with the product unsecured to the frame holder difficult so take this into consideration if buying.

Strong lock. Easy to use and easy to change the code to something personal

This lock is rubbish. Had it for less than a month. Bike stolen. Lock was bent too easily. Don't recommend.

Nice and long, so easy to lock the bike. Attached to the bike with bracket for carrying, but just slightly difficult to get off the mounting. Looks strong and secure. Good value for money.